耐火材料 ›› 2021, Vol. 55 ›› Issue (5): 395-399.DOI: 10.3969/j.issn.1001-1935.2021.05.005

• 研究开发 • 上一篇    下一篇

发泡-注凝结合催化氮化法制备Si3N4多孔陶瓷

韩磊(), 李孝建, 张海军()   

  1. 武汉科技大学 省部共建耐火材料与冶金国家重点实验室 湖北武汉 430081
  • 收稿日期:2021-07-06 出版日期:2021-10-15 发布日期:2021-10-25
  • 通讯作者: 张海军,男,1970年生,博士,教授。E-mail: zhanghaijun@wust.com.cn
  • 作者简介:韩磊:男,1987年生,博士。E-mail: hlad0422@163.com
  • 基金资助:
    国家自然科学基金面上资助项目(51872210);国家自然科学基金面上资助项目(52072274);湖北省教育厅高等学校优秀中青年科技创新团队计划项目(T201602)

Preparation of Si3N4 porous ceramics via foam-gelcasting combined catalytic nitridation

Han Lei(), Li Xiaojian, Zhang Haijun()   

  1. The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China
  • Received:2021-07-06 Online:2021-10-15 Published:2021-10-25
  • Contact: Zhang Haijun

摘要:

以高纯Si粉为主要原料,以Fe(NO3)3·9H2O为催化剂,以十六烷基三甲基溴化铵为发泡剂,采用发泡-注凝结合催化氮化法制备Si3N4多孔陶瓷。研究了氮化温度(1 200、1 250、1 300、1 350 ℃)和催化剂用量(w,0、1%、3%、5%)对Si3N4多孔陶瓷物相组成、显微结构及常规物理性能的影响。结果表明:当Fe(NO3)3·9H2O用量为1%(w)、氮化温度为1 300 ℃时,所制备Si3N4多孔陶瓷的显气孔率和耐压强度分别为55.1%和29.7 MPa;多孔陶瓷相对较高的强度可归因于Fe(NO3)3·9H2O的高效催化作用促进了试样内部Si3N4晶须的生长发育,进而对其力学性能的改善起到了积极的作用。

关键词: Si3N4多孔陶瓷, 发泡-注凝, 催化氮化, 显微结构, Si3N4晶须

Abstract:

Si3N4 porous ceramics were fabricated by foam-gelcasting combined catalytic nitridation using high-purity silicon powders as the starting material and Fe(NO3)3·9H2O as the catalyst and CTAB as the foaming agent.The effects of the nitriding temperature (1 200,1 250,1 300 and 1 350 ℃) and the catalyst addition (0,1%,3% and 5%,by mass) on the phase composition,microstructure and physical properties of the Si3N4 porous ceramics were investigated.The results show that with 1% of Fe(NO3)3·9H2O,the Si3N4 porous specimen nitridized at 1 300 ℃ has 29.7 MPa of compressive strength and 55.1% of apparent porosity.The relatively high strength of the porous ceramics can be attributed to the highly catalytic effect of Fe(NO3)3·9H2O,which promotes the growth of Si3N4 whiskers inside the specimen and plays a positive role in the improvement of mechanical properties.

Key words: silicon nitride porous ceramics, foam-gelcasting, catalytic nitridation, microstructure, silicon nitride whiskers

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